Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejj.22-22016

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DOI： 10.2208/jscejj.22-22043

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DOI： 10.2208/jscejcei.78.2_I_43

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DOI： 10.11532/jsceim.1.1_452

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DOI： 10.11532/jsceim.1.1_80

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DOI： 10.1108/CI-04-2021-0087

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DOI： 10.2208/jscejcei.77.2_II_9

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.77.2_ii_50

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.74.II_93

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.74.I_159

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DOI： 10.2208/jscejcei.74.II_118

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.74.I_153

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer Verlag  

3D digitization techniques, such as laser scanning and/or SfM (Structure from Motion), are often used for recording and documenting the archaeological heritages at many sites recently. As-is situations can be easily captured by those techniques for archiving the present geometrical information. Since excavation, different research teams might have conducted investigations and/or restoration work in different periods to date. Throughout the repeated re-excavation and backfill, there may be the places where some aspect dramatically changes. The photo records taken in the past investigations sometimes look very different from the present appearance and the differences are also difficult to describe and to record objectively. This paper proposes a methodology to support the collation of past photo data and current presence by image-processing. Estimating the 3D position and the orientation of the camera which took the photo in the past, by using correspondences between the pixels on the past photo and the reconstructed 3D shape of the current scene. By making corresponding pairs of the identical feature points between the past photo and the current 3D scene, solving PnP problem gives a good estimate of the camera viewpoint in the past. By rendering CG of the current 3D scene from the estimated viewpoint of the past camera, the CG and the past photo image can be aligned and overlaid precisely on the same view. This overlaid image allows to check the temporal changes of the object with pixel-unit precision and to help the maintenance work for inspection and repair. This paper applies to the actual site of Barbar temple at the Kingdom of Bahrain and shows the quantitative evaluation capability.

DOI： 10.1007/978-3-030-01762-0_1

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.72.ii_96

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.72.ii_40

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Language：Japanese  

CiNii Books

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.73.i_219

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.73.i_365

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This paper proposes a flexible technique framework for optimizing the scanning plans of outdoor constructions using photogrammetry-based modeling and mathematical optimization. Our framework is capable of accepting onsite feedbacks and flexibly reflecting them on the recalculation to complete the scanning through an optimized manner, thus the users can make the most use of the executed scans during the ongoing work. Based on a structure-from-motion (SFM) technique and a patch-based meshing technique, taking photos of the target site during a preliminary survey makes it possible to acquire three-dimensional (3D) point clouds and dense 3D surface meshes systematically. Such 3D information enables elaborate estimation of precise visible characteristics of the targeted scanning object from multiple different scanner viewpoints, so that a mathematical programming method can then be used to derive an optimal scan with the minimum number of measurement points and their layout necessary to scan all surfaces of the target object. On the hand, since on-site ground conditions at the planned scanner positions are sometimes unavailable when setting up the scanner, prepared plans may need to be modified or improved. The proposed optimization scenario can accept such modifications by editing the prepared 3D mesh models so as to fit the physical conditions. The proposed method was applied to an actual field of a castle ruin, where the stone walls need to be managed for conservation. A unmanned aerial vehicle (UAV) was used to collect photos for photogrammetry-based 3D modeling and initial optimization of the scanning plan, which needed to be modified to change the number of scans and a scanner position due to the ground conditions and requests from collaborating investigators on the spot. Eventually, the quality of the acquired point cloud was adequate for further investigations in terms of coverage and density with minimum scans.

DOI： 10.2208/jscejcei.71.I_169

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

Numerous developed countries are currently facing problems resulting from the aging of decades-old infra-structures built during periods of rapid economic growth. Additionally, under prevailing severe fiscal circumstances found in many aging societies, it is not realistic to deal with every failing infrastructure facility in every part of a country. This paper focuses on pipelines for water supply, sewerage, and agricultural water use, many of which are buried, which makes investigating their distortion and deterioration difficult without excavation. Under such conditions, maintenance work proceeds slowly and failing buried pipes eventually rupture, which frequently inconvenience citizens and damage property. The authors have been proposing an investigation system that utilizes an RGB-D camera, or a depth-imaging device to examine pipeline interiors. RGB-D cameras can collect not only the RGB-color imagery, but also three-dimensional (3D) depth information from pipe interiors. Taking advantage of the com-pact size of RGB-D cameras, our proposed concept is based on the construction of a self-propelled robot system that will scan pipeline interiors in-situ, thus providing a means of conducting fast and inexpensive investigations that do not require large-scale excavations. This paper describes a novel method that can be used to detect deflection in pipe-shaped structures directly based on depth image capturing with a RGB-D camera. In order to settle intersection planes for deflection examination, the key idea is to find the longitudinal direction from the captured depth images based on the normal vector information, even in the cases that captured 3D point distribution does not form an entire piped-shape. This paper also shows that, based on a prototype implementation using a Kinect camera, the proposed method shows effective performances for actual point cloud data with light computational costs.

DOI： 10.2208/jscejcei.71.I_72

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Language：Japanese  

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DOI： 10.2208/jscejcei.70.I_243

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DOI： 10.2208/jscejcei.70.I_222

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Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.70.i_257

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-BLACKWELL  

Previously we proposed an eccentric figure-eight coil that can cause threshold stimulation in the brain at lower driving currents. In this study, we performed numerical simulations and magnetic stimulations to healthy subjects for evaluating the advantages of the eccentric coil. The simulations were performed using a simplified spherical brain model and a realistic human brain model. We found that the eccentric coil required a driving current intensity of approximately 18% less than that required by the concentric coil to cause comparable eddy current densities within the brain. The eddy current localization of the eccentric coil was slightly higher than that of the concentric coil. A prototype eccentric coil was designed and fabricated. Instead of winding a wire around a bobbin, we cut eccentric-spiral slits on the insulator cases, and a wire was woven through the slits. The coils were used to deliver magnetic stimulation to healthy subjects; among our results, we found that the current slew rate corresponding to motor threshold values for the concentric and eccentric coils were 86 and 78A/mu s, respectively. The results indicate that the eccentric coil consistently requires a lower driving current to reach the motor threshold than the concentric coil. Future development of compact magnetic stimulators will enable the treatment of some intractable neurological diseases at home. Bioelectromagnetics. 35:55-65, 2015. (c) 2014 Wiley Periodicals, Inc.

DOI： 10.1002/bem.21886

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

This paper proposes an AR (augmented reality) interface for on-site use in an archaeological project. We have already been developing a web-based 3D archiving system for supporting the diverse specialties and nationalities needed for carrying out the survey and restoration work of the archaeological project. Our 3D archiving system is designed for the spontaneous updating and sharing of information on findings in order to better enable frequent discussions, through a 3D virtual copy of the field site that a user can visit, explore, and embed information into, over the Internet. Here we present an AR user interface to enhance access from mobile devices at the actual site to the archiving system. Using SFM (structure from motion) and solving the Perspective-n-Point (PnP) problem, a photo taken at the site can be stably matched to the pre-registered photo sets in the archiving system and the archived information is automatically overlaid on the photo, just in the same manner as exploring the virtual version of the site on desktop PCs. Our implementation effectively works on an on-going project in Saqqara, Egypt.

DOI： 10.1109/ISMAR.2015.68

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Language：Japanese  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER-VERLAG BERLIN  

This paper addresses management issues in a multifaceted archaeological project, using a web-based archive system with a 3D user interface. The diverse specialties needed for driving the surveys and restoration work at the archaeological project and the fact that the team is composed of people of different nations means work may progress asynchronously, which can result in a failure to maintain the communications needed to ensure that everyone and everything is kept up to date. A mechanism is desirable for the spontaneous updating, accumulating and sharing of information on findings to better enable frequent discussions. The proposed system generates a 3D virtual copy of the field site that a user may explore and embed information by making an association with a physical object at a site over the Internet. Here we present the implementation scheme of the proposed system based on an on-going project at Mastaba Idout in Saqqara, Egypt.

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Language：English   Publishing type：Research paper (international conference proceedings)  

Studies on the great pyramid of King Khufu (2509-2483 BCE ±25) in Egypt are numerous, but only a few surveys, which are the basis of any hypotheses on the construction of a pyramid, have been conducted. In particular, since no observation of the core of the pyramid has been made, theories about the structure are still hypothetical. In 2013, a Japanese TV production company had the opportunity to climb the northeast corner of the pyramid to shoot a crevice that led to an open space (named 'cave') inside the pyramid, located about 80m from the ground. The authors are fortunate to be allowed to use this video footage for academic research. We employed a 'structure from motion' (SfM) technique using Microsoft Photosynth to reconstruct the 3D point cloud of the surface of the cave. Twenty minutes of footage was split into thirty thousand image frames, out of which we selected three hundred images shot using several smooth motions of the camera and used these for the SfM process. SfM tracks the 'feature points' in the image sequence to estimate the camera motion and then triangulates these feature points to produce the point clouds. As a result, the static feature points from the overall surface of the cave were effectively collected and reconstructed as point clouds, whereas inconsistent points from a moving person are automatically eliminated through the SfM process. Thus we have produced, albeit in a small area, the first record of the actual structure of the great pyramid's core. The production of a 3D model from existing video footage is a rather new methodology in the field of archaeology. This set of techniques can be applied to not only academic investigation but also to the restoration and conservation of damaged heritage and artifacts. © 2013 IEEE.

DOI： 10.1109/DigitalHeritage.2013.6743739

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive method for treating various neurological and psychiatric disorders. With the growing demands of neuropathic pain patients and their increasing numbers, rTMS treatment tools are becoming more necessary. rTMS uses electromagnetic induction to induce weak electric currents by rapidly changing the magnetic field. Targeting the electric current to a specific part of the brain is one treatment for pain relief. This paper focuses on treatment for neuropathic pain caused by a lesion or disease of the central or peripheral nervous system, including stroke, trauma, or surgery. However, the current style of rTMS treatment is still developing and is so technically specialized that only a limited number of hospitals and only a handful of specialists can provide this therapy. The existing rTMS systems use an optical markerbased 3D sensing technique that positions the stimulation coil to target the small region of interest in the brain through coregistration with pre-scanned MRI data. This system requires the patient to be immobilized on a bed. The optical markers for 3D sensing are placed on the patient's head to maintain accurate positioning. We propose a constraints-free, markerless rTMS system, which employs ego-motion, a computation technique to estimate relative 3D motion of a camera to what the camera sees. We use a ToF sensor as a camera, which is capble of capturing shape information from a single viewpoint instantly. The markerless target spot is based on the shape features of the patient's face. This paper shows the process of a prototype system and its potential for achieving an easy-to-handle system framework. © 2013 IEEE.

DOI： 10.1109/EMBC.2013.6610318

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/vsmm.2012.6365983

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Language：Japanese   Publisher：The Japanese Society of Medical Imaging Technology  

Repetitive transcranial magnetic stimulation (rTMS) is a noninvasive method for treating various neurological and psychiatric disorders such as neuropathic pain that may be caused by lesions or diseases of the central or peripheral nervous system. A specific part of the brain is targeted for exposure to a localized magnetic field in order to relieve pain. Existing rTMS systems employ optical marker-based three-dimensional (3D) sensing techniques for positioning the stimulation coil to target the region to be treated in the brain and for referring to previously scanned MRI data to confirm the target position. When such marker-based sensing systems are used, physicians must perform registration for each treatment. In addition, the patient must remain immobile on the bed where the optical markers are set during treatment. To address these issues, we propose an image-based sensing method for rTMS employing a stereo camera to detect the shape of the patient's face rather than optical markers. The results of the present study show that the proposed method can be used to localize the stimulation target on the brain surface in real time while providing both an unconstrained therapeutic environment for patients and a registration-free system for physicians.

DOI： 10.11409/mit.30.143

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Other Link： http://search.jamas.or.jp/link/ui/2012299887

Language：English   Publishing type：Research paper (international conference proceedings)  

Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive method for treating various neurological and psychiatric disorders. This paper focuses on a technical as-pect of this treatment method for neuropathic pain that can be caused by a lesion or disease of the central or peripheral nervous system, including stroke, trauma or surgical operation. rTMS uses electromagnetic induction to induce weak electric currents by rapidly changing the magnetic field. Targeting a specific part of the brain to locate the magnetic field works as a treatment for pain relief. This is the reason why the current style of rTMS treatment is still developing and is so technically specialized that only a limited number of hospitals and only a handful of special-ists can provide this therapy. The existing systems of rTMS are based on an optical maker-based 3-dimensional (3D) sensing technique for positioning the stimulation coil to target the small spot in the region of interest in the brain, and for referring pre-scanned MRI data to check the target position. Furthermore, the existing systems require the patient to be fixed on a bed in which optical markers for 3D sensing are placed during the treatment to maintain positioning precision. With the growing demands of neuropathic pain patients and their increasing numbers, new approaches and systems to achieve more supportive and easy-to-handle navigation have been proposed lately for rTMS treat-ment. This paper proposes a quantitative index for localization precision, considering an uncertainty measure. Uncertainty is technically defined as a parameter, associated with the result of a measurement that characterizes the dispersion of the values that could reasonably be attributed to the measurement. This paper shows a detailed example of the uncertainty derivation for rTMS treatment, based on trial tasks for searching the spots on the brain that cause muscle twitch. © 2012 IEEE.

DOI： 10.1109/ICCME.2012.6275590

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Hospital information systems (HIS) have turned a hospital into a gigantic computer with huge computational power, huge storage, and wired/wireless local area network. On the other hand, a modern medical device, such as echograph, is a computer system with several functional units connected by an internal network named a bus. Therefore, we can embed such a medical device into the HIS by simply replacing the bus with the local area network. This paper designed and developed two embedded systems, a ubiquitous echograph system, and a networked digital camera. Evaluations of the developed systems clearly show that the proposed approach, embedding existing clinical systems into HIS, drastically changes productivity in the clinical field. Once a clinical system becomes a pluggable unit for a gigantic computer system, HIS, the combination of multiple embedded systems with application software designed under deep consideration about clinical processes may lead to the emergence of disruptive innovation in the clinical field. © 1997-2012 IEEE.

DOI： 10.1109/TITB.2012.2210434

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Language：English   Publishing type：Research paper (international conference proceedings)  

We are developing stimulation coil navigation systems for home use of repetitive transcranial magnetic stimulation (rTMS). rTMS is effective for intractable diseases of the nervous system. However, the effects of rTMS last only for several hours, requiring a continuing daily rTMS therapies in a nearby clinic. A magnetic navigation system, the present system for fulfilling such needs, uses downsized, lightweight, low-cost magnetic sensors with datasets relating the magnetic field to the 3D position of the stimulation coil instead of the complicated handling and operation of large-scale and expensive devices or systems like a 3D position-measurement device. This system has been modified for home use and is easily available to non-medical staff. However, in a hospital, a large number of datasets, at least 500, is required, so collecting datasets might be a burden for the physician. To solve this problem, this paper proposes a method for extracting the necessary datasets for navigation. In the proposed method, many more datasets, which can handle any shape of a patient's head, are prepared in advance. The physician then collects only a few samples in the hospital. The system extracts the remaining datasets necessary for navigation by applying geometric model approximations like Delaunay triangulation or the ellipsoid model to the data for these samples. We evaluate the efficiency of the proposed method by a simulation of extracting datasets and navigating using a head model. The proposed method reduces the number of datasets collected by physicians from 500 to 10, thus reducing physicians' burdens. © 2012 IEEE.

DOI： 10.1109/ICCME.2012.6275591

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Publishing type：Research paper (scientific journal)  

Repetitive Transcranial Magnetic Stimulation (rTMS) is effective for intractable diseases of the nervous system. As the effects of rTMS last only several hours, rTMS therapies need to be continued daily. Under present circumstances, it is difficult to use rTMS in patients' home, because only experienced physicians in limited hospitals can use the expensive and complicated rTMS system. Therefore, we developed a magnetic navigation system for home use of rTMS. The proposed system uses inexpensive and small magnetic sensors; hence it is suitable for home use. By using the proposed method, even people who have no medical knowledge and technique can easily navigate the coil to the optimal position preliminarily specified by expert physicians. Our system needs to collect some dataset which consists of magnetic field and the corresponding position of the coil at the patients' initial visit. Since it is bothersome to collect a large number of dataset, we reduced the dataset by approximation using multi-regression analysis.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER-VERLAG LONDON LTD  

Augmented Reality (AR) is a technique that synthesizes and displays virtual objects such as CG in images of real environments. It is important to harmonize real environment with CG and to render the harmonized scene. In this research, we propose a method for rendering virtual objects by using Image-based Lighting (IBL) that uses polyhedral subdivision in AR. We confirmed that hierarchical light source map constructed by polyhedral subdivision reduces the computation cost and maintains the effect of IBL.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER-VERLAG LONDON LTD  

Structured light is used for measuring 3D shape efficiently by active stereo methods. The measurement resolution of this method depends on not only the interval of structured light but also the pattern direction. In this paper, we propose a method for acquiring homogeneous data by structured light measurements. The method uses multiple structured lights with different directions and then registers the data based on measurement density over the object surface. Our experimental results showed that the proposed method is capable of reproducing 3D shape of measurement objects more precisely.

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Language：Japanese  

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Language：Japanese   Publisher：Japanese Society for Medical and Biological Engineering  

Ultrasonic diagnosis requires substantial experiences for both acquiring and reading echography. This paper describes a novel method for synthesizing ultrasound image with artifacts according to user's probe manipulation. The proposed method is a sample-based approach that stores pre-captured real echo images as a volume data set in which each voxel has multi-directional values. Output echography is synthesized by interpolating voxel values, considering spatial arrangement and directivity of the voxel values. Experimental results demonstrated spatially seamless echography synthesis and characteristic artifacts with various probe postures.

DOI： 10.11239/jsmbe.47.51

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Language：English   Publishing type：Research paper (international conference proceedings)  

Colors in nature can be classified into two categories: pigment colors and structural colors. Structural colors, which are caused by optical path differences of reflected rays in microstructures, change depending on viewing angle and lighting conditions. In the present paper, we propose a generic approach for rendering structural colors in real-time. The proposed method uses optical path differences as common parameters to allow unified treatment of various types of microstructures, such as thin films, multilayer films, and diffraction gratings. To achieve real-time rendering, we store pre-computed information related to specific microstructure and lighting conditions on several kinds of textures. The textures are used as a look-up table in the rendering process. The proposed method can be applied to objects that have arbitrary shape and enables rendering from any viewing direction and under any lighting conditions. Copyright © 2009 by the Association for Computing Machinery, Inc.

DOI： 10.1145/1643928.1643952

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Language：English   Publishing type：Research paper (international conference proceedings)  

Superimposing virtual objects onto physical space, mixed reality (MR) is an effective technique for simulating an overview of a scenery including existing and synthesized objects. MR requires geometrical and photometric consistency between physical scenes and the CG (computer graphics) objects to be rendered. Marker-based approach with mirrored ball enables acquiring both geometrical and photometric (lighting) information from physical scenes through single camera input. However, the marker detection occasionally fails under too bright or dark lighting conditions which are desired to be reflected to the output as well. This paper proposes a method to use HDR (highdynamic range) video input for stabilizing marker recognition and capturing lighting conditions in parallel. The experimental results showed an enhanced performance in interactive rate.

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Language：English   Publishing type：Research paper (international conference proceedings)  

The motion capture technique is gathering more and more attention because of its powerful potential for providing life-like motions in computer graphics (CG) animation via sample-based motion creating techniques. Since motion data is multi-dimensional and spatio-temporal data that is difficult to edit as desired, an effective scheme for reusing captured motion sets to create new motion is advantageous. Reusing a motion data set requires effective browsing and extraction techniques that enable the user to look up and capture the relations among the motion contents in the motion data set. We propose a new framework for a motion editing tool by focusing on the connectivity between motions and utilizing it as a filter to extract the desired motion contents from a motion database. The proposed system uses a tree structure for expressing possible connective motion paths in the motion database. The motion connective tree can be a useful user interface to browse and select a motion scenario by exploring the existing motion data sets in the database. Our prototype system demonstrates an easy-tounderstand interface to explore and quickly edit a motion data set by selecting icons of the motion tree nodes. © 2008 IEEE.

DOI： 10.1109/DICTA.2008.67

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Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Image Electronics Engineers of Japan  

The case of therapy for the balance a deficit facial surface and piece of chin in an accident or a disease, make an artifact of copy area of body called facial prosthesis, often therapy in such a way that balance a deficit. To maintain the facial prosthesis stable need to fix part with a little movement of face.In this announcement propose restoration technique of face shape that changes time seriesto detect part with a little movement of face from an expression change.This technique uses the pattern projection method that used the multi slit that has the same space resolution as the gray code projection method to obtain minute shape of the face. The shape change is tracked by the multi pattern matching method based on the face shape obtained by the gray code projection method.Reduction in the mis-correspondence by the pattern matching method is achieved by the labeling method using the smoothness of the face.

DOI： 10.11371/aiieej.36.0_47

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Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publisher：The Institute of Electrical Engineers of Japan  

This paper describes a fabrication scheme for integrating an optical fiber-delivered catheter for ultrasound (US) imaging. In this catheter, pulsed laser is focused and guided into a tapered optical fiber. The laser passes through the fiber and is refocused to generate laser-induced breakdown (LIB), which emits spherical pulsed US wave. The reflected US waves are received with a hydrophone array to reconstruct 3D images with synthetic aperture method. We examined the probability of LIB generation relative to pulsed energy level for stably producing US pulses and clarified a suitable specification for a laser delivering fiber. Proto-type catheter demonstrated real-time 3D imaging, in which LIB is continuously generated on the tip of the catheter and frontal situation is captured in 3D images in realtime process.

DOI： 10.1541/ieejsmas.127.284

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Other Link： https://jlc.jst.go.jp/DN/JALC/00293189888?from=CiNii

Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

We propose the estimation method for pointing direction from users' posture to establish smooth interaction between users and virtual objects in virtual reality space. We describe the pointing direction as weighted average of reference directions which connect between some parts of user's body and the fingertip of index finger. The weights, which depend on individuals, direction and distance, are estimated through repetitive calculation. The experiments reveal that the proposed method can estimate the direction which users intend to point accurately.

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Other Link： http://id.nii.ac.jp/1001/00010005/

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Language：English   Publishing type：Research paper (international conference proceedings)  

In manufacturing factories, it is important to reduce costs and to ensure product quality in suffer market competition. With the massive retirement of expert engineers in aging society, an effective training/education scheme for new workers is desired. However, cell production system is widely used lately and each worker is supposed to do every step of the process and thus the worker should learn more and more kinds of manufacturing skills and process. It is also desired that fresh workers can learn the skills by themselves, however, transferring skills is a very difficult issue. Learning by print-based manuals is not effective, because it is not easy to understand how to operate 3D objects and how the process transition goes from 2D documents. Besides, flipping the pages to find the information during the work is troublesome. In this research, a new training system is built with a movable head-up display, which can be adapted to actual workspaces and allows the user to access the digitized guidance contents with semitransparent touch-sensitive screen. The effectiveness is experimentally shown by applying the proposed system for some tasks to make "origami", a kind of skillful paper craft works. © 2007 IEEE.

DOI： 10.1109/DICTA.2007.4426773

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Language：English   Publishing type：Research paper (international conference proceedings)  

There is an ever increasing demand from industry that engineers, especially those in the field of computer science, have a better command of English. This paper reports the pilot ESP teaching project in one of the biggest faculties of engineering in Japan. About 150 second-year students were given the weekly assignment of translating what they had learned in class about a programming language into English. The project was carried out by a team of specialists, both in the content area and language teaching, and implemented on CEAS, an e-learning platform which emphasizes the face-to-face lecture. The project proved to be successful as the test results in English and the programming language showed a strong correlation. The student perception of the demanding curriculum was also positive. Through trial and error in the course of one year, the ESP teaching curriculum for the first to third vear students was developed. © 2007 IEEE.

DOI： 10.1109/IPCC.2007.4464050

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Language：Japanese   Publishing type：Research paper (scientific journal)  

Colors in nature can be classified into two categories: colors which originate in pigments(coloring matter) and structural colors, which are caused by optical path differences at the level of microscopic structures. Structural colors change according to viewing angles and lighting conditions. This paper proposes a generic method for rendering structural colors in real time. The proposed method's use of optical path differences as common parameters enables unified treatment of various types of microscopic structures and representation by textures that store optical path differences, which can speed up rendering. The proposed method can be applied to object of arbitrary shapes and enables rendering from random viewing angles and lighting conditions in real time.

DOI： 10.3169/itej.60.1593

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

This paper proposes a three-dimensional measurement system with a simple structured system. The proposed system consists of a camera with a fish-eye lens and a cylinder whose inside is coated by a silver reflective layer. A target object is placed inside the cylinder and an image is captured by the camera from right above. The captured image includes sets of points that are observed from multiple viewpoints : one is observed directly, and the other is observed via the mirror. Therefore, the whole shape of the object can be measured using stereo vision in a single shot. An actual experimental situation was simulated and the three-dimensional shape of the target object was measured using the simulated image. In addition, a prototype system was implemented and the shape of the real objects were measured. The results have demonstrated that the proposed method is effective for measuring the whole three-dimensional shape.

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Other Link： http://id.nii.ac.jp/1001/00017985/

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Publishing type：Research paper (international conference proceedings)  

The documents become more legible by doing the annotation. There are some systems that support annotating or reading digital document, but they cannot be applied to physically printed-paper documents. Moreover we are not allowed to write notes in vintage books or books of a library. This paper proposes the system of "Digital Bookrest", which adds the electronic property to the physically printed-papers. The components of the proposed system are a digital camera, a video projector and a pen-shape device with LED. The system estimates positions of paper documents and annotated points in the captured image, and overlays annotations onto the real paper document using a video projector. The prototype system was implemented, and experiments are performed to confirm the availability.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER-VERLAG BERLIN  

This paper presents a new scheme for synthesizing hand motion to grasp various objects. Hand motion has a variety of expression with its high degrees of freedom and the functional motions are especially complex and difficult to synthesize. This paper focuses on a fact that actual grasp motion varies depending on the features of the object including its size and shape, which give important clues for reproducing a proper hand motion to manipulate them. Based on this idea, we propose a scheme to sample grasp motions and synthesize the whole hand motion including approach to the object, preparation of the hand shape and grab motion. Synthesized animation demonstrated a potential for easily designing functional motions for hand animation.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOC APPLIED PHYSICS  

Paracentesis is a common operation for pain clinics and spinal anesthetics administration and requires empirical training and flexible skills to cope with the various cases of individual patients. We propose a method of measuring and visualizing three-dimensional vertebra shapes for assisting anesthesiologists, by an ultrasound imaging technique that is prevalent in many hospitals and has no harmful risks to the human body. The proposed system enables anesthesiologists to investigate vertebra shapes by freehand probing. Three-dimensional reconstruction and graphical rendering can be performed by monitoring the motion of the ultrasound probe and registering the scanned echography into the identical three-dimensional space. Considering the echography imaging features, volume rendering of hard tissue surfaces is achieved and interactive measurement is possible. This paper describes the practicability of the proposed method based on experimental measurement of both phantom and real lumbar vertebre and sacra.

DOI： 10.1143/JJAP.44.4637

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Electrical and Electronics Engineers Inc.  

Three-dimensional (3D) visualization or 3D monitoring of patients or infected animals is useful in actual clinical environment. We propose a 3D imaging system with a single camera and multiple mirrors. The camera is located directly above the object and the mu ltiple mirrors are placed surrounding the object. The single captured image includes multiple viewpoint images: the object captured directly and the same objects reflected by the mirrors. After a simple calibration of the measurement, the 3D volume data are reconstructed with the visual hull based method. Texture mapping is also performed to enhance the reality. A living object was observed in usual environment using this system. The results have demonstrated effectiveness of the system. © 2005 IEEE.

DOI： 10.1109/iembs.2005.1617295

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Language：English   Publishing type：Research paper (international conference proceedings)  

This paper presents the "AirGrabber", a virtual keyboard suitable for wearable computers, by which a user can enter characters by "typing" in the air on a virtual keyboard. The AirGrabber detects keystrokes by monitoring the motions of the fingers and hand through a miniature camera and a tilt sensor on the user's wrist.

DOI： 10.1145/1152399.1152467

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Language：Chinese   Publishing type：Research paper (scientific journal)   Publisher：Inst. of Image Information and Television Engineers  

Real-time rendering of realistic motion of fluids is a method that immerses a player into an interactive application such as computer games. Interaction of fluids with rigid bodies is important because fluids and rigid bodies move influencing each other. Fluid simulation based on Computational Fluid Dynamics (CFD) is useful for rendering a visually plausible behaviour of fluids. However, due to the high computational cost of CFD, real-time rendering of fluids needs a fast simulation. This paper describes the particle-based fluid simulation based on Smoothed Particle Hydrodynamics which includes interactions between fluids and rigid bodies, its fast implementation, and the manner of rendering a realistic water surface with optical phenomena such as reflection, refraction, and the Fresnel effect. The proposed method enables real-time animation of water with rigid body interaction.

DOI： 10.3169/itej.59.1488

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE-INT SOC OPTICAL ENGINEERING  

This paper presents a new framework for interactive Augmented Reality(1) (AR) and Mixed Reality(2) (MR) representation using both visible and invisible projection onto physical target objects. Projection-based approach for constructing AR/MR uses physical objects such as walls, books, plaster ornaments and whatever the computer generated contents can be optically projected onto, namely, projection makes it possible to use real objects as displays. What we demonstrate in this study is to employ near-infrared pattern projection for triangulation so that scanning and updating the geometry data of the object is automatically performed in background process; thus parallel processing to provide AR/MR representation can be achieved according to dynamic physical geometry changes.

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Language：English   Publishing type：Research paper (scientific journal)  

This paper describes an ultrasound (US) catheter using laser induced breakdown (LIB) phenomenon and 3D imaging with the catheter. In this catheter, laser focused with an optical lens is introduced into a tapered optical fiber. The laser passed through the fiber is refocused with lenses to generate LIB inside of a small balloon filled with D2O and spherical and pulsed US transmitted from LIB. The reflected wave was received at hydrophones and 3D images were reconstructed with synthetic aperture method. Using this catheter, we made the experiments of the imaging of an object in motion. We succeeded in presenting 3D dynamic image with the frame rate of about 5 frame/sec. © 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejsmas.124.459

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Language：English   Publishing type：Research paper (scientific journal)  

This research focuses on developing visual assistance for ultrasound echographic measurement. Proposed system performs a direct projection of the intersectional imagery onto the patient's body by an optical projector. The surface shape of the patient is taken into consideration for image projection. Optical shape measurement and graphical synthesis techniques are combined for producing distortion-free images so that the physician can intuitively manipulate the ultrasonic probe and observe the echography in the identical physical space. © 2005, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejsmas.125.176

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer Verlag  

Our research projects aim to connect various VR/MR platforms and to realize the seamless collaborative works with the intuitive operations whenever and wherever users like. In order to realize an ideal collaborative workspace, an effective handling scheme for both interactive virtual objects and system operation of VR/MR platform is needed. In this paper, we describe the three components, which are the direct manipulation interfaces for potable MR space and for fixed shared VR/MR space, and Interactive 3D Marker for displaying and manipulating virtual objects reflected lighting and geometry conditions of the real world. These components can give users seamless manipulation workspace by the natural operations such as they behave in their daily life. We also introduce Interactive Interior Design System using these components. This system realizes to coordinate the suitable interiors in the real space, by the free manipulation of virtual interior objects reflected the geometry and the lighting condition of the real space. © Springer-Verlag Berlin Heidelberg 2005.

DOI： 10.1007/11499145_18

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Language：English   Publishing type：Research paper (international conference proceedings)  

A three-dimensional map is more suitable for pedestrian navigation than a two-dimensional map that is used in existing systems, because the three-dimensional map allows a walker to check the present position and destination from arbitrary viewpoint easily. Therefore, a simple method for generating three-dimensional maps is required, while they are usually prepared by tiresome work based on the design for a building, an underground mall, and so on. This paper proposes a generating method of a three-dimensional map based on motion stereo approach using an omni-directional vision sensor, whose position and posture are acquired by an acceleration sensor and a gyro sensor.

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Language：English   Publishing type：Research paper (international conference proceedings)  

Paracentesis is a common operation for pain clinics and spinal anesthetics administration and requires empirical training and flexible skills to copewith the various cases of individual patients. We propose a method of measuring and visualizing three-dimensional vertebra shapes for assisting anesthesiologists, by an ultrasound imaging technique that is prevalent in many hospitals and has no harmful risks to the human body. The proposed system enables anesthesiologists to investigate vertebra shapes by freehand probing. Three-dimensional reconstruction and graphical rendering can be performed by monitoring the motion of the ultrasound probe and registering the scanned echography into the identical three-dimensional space. Considering the echography imaging features, volume rendering of hard tissue surfaces is achieved and interactive measurement is possible. This paper describes the practicability of the proposed method based on experimental measurement of both phantom and real lumbar vertebrae and sacra.

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Language：Japanese   Publisher：フレグランスジャーナル社  

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Language：Japanese   Publisher：THE VIRTUAL REALITY SOCIETY OF JAPAN  

As personal computers and their peripheral units become smaller and lighter, portable user interfaces, such as portable keyboards, are also required. Although a number of devices have been proposed, thus far the devices have been difficult to use because of restricted functionality or the requirement for special operational methods. This paper presents the "AirGrabber", a virtual keyboard suitable for wearable computers, by which a user can enter characters by "typing" in the air on a virtual keyboard. The AirGrabber detects keystrokes by monitoring the motions of the fingers and hand through a miniature camera and a tilt sensor on the user's wrist.

DOI： 10.18974/tvrsj.9.4_413

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Language：English   Publishing type：Research paper (international conference proceedings)  

A 360-degree vision sensor system mounted on circular wing planform technology opens new multi-disciplinary research and application opportunities. Our research at the Nara Institute of Science and Technology (NAIST) has been focusing on technology that will benefit search and rescue activities. We are interested in bandwidth optimization for transfer of vision sensor data by wireless transmission on Local Area Networks, packet or Ethernet radio, and other low bandwidth transmission systems complying with local laws in Japan. In the past, bandwidth and low transmitter power limits have been the main limiting factors in vision systems, because of the huge size of data sets to be transferred. In this paper we introduce a multi-tier method to fuse data from multiple vision sensors, which optimizes data transfer of 360-degree panoramic images used in search and rescue operations. Our research platform is integrated into a circular wing Unmanned Aerial Vehicle (UAV) with Vertical Take-Off and Landing (VTOL) capability, which was invented and developed at NAIST and is the only UAV of its type in the world. The combination of a unique VTOL circular wing UAV and vision fusion methods presented in this paper, together with multiple cameras having multiple optical resolutions, delivers highly optimized image enhancement features of 360-degree panoramic images over low bandwidth systems. These images are then transferred in near real-time to a base station (360-degree immersive Virtual Reality (VR) display system) located up to 14 kilometers away. The images from the immersive VR display system can then be re-broadcast over the Internet on a large-scale to search and rescue teams, government officials, and fire and police units. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

The daily medical check is effective to disease prevention. However, visiting a hospital puts a strain to the patients. To solve this problem, this paper proposes newly concept and device for telemedicine. The ubiquitous medical care environment is the concept of the advanced telemedicine system, which realizes the place- and time-independent medical care by dividing people (medical doctor, patient,... etc.). The wearable ultrasound device is a principal equipment of ubiquitous environment, which realize an echograpby anytime, anywhere. The prototype device is composed of an ultrasound measurement module, compact computer, and small LCD monitor. A proposed system was evaluated by image transmission experiments between prototype device and other computers. Experimental result shows much performance and effectiveness of proposed system. (C) 2004 CARS and Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ics.2004.03.180

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Language：English   Publishing type：Research paper (international conference proceedings)  

This paper proposes an intuitive method to create and edit human motion in computer graphics (CG) by means of introducing Labanotation as a intermediate description of the body motion. Labanotation is a systematic description for human motion in dancing and is capable of recording detailed motion of whole and each part of the body with symbols as musical score is. We propose a framework to construct word sets to refer Labanotation in order to express human motion so that the user can create the CG human motion by selecting and combining limited commands, instead of taking time to adjust number of joint angle values. This paper shows the data structure for describing the human motion divided into motion units and the scheme for mapping the motion units onto modified or extended Labanotation symbols.

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

This paper proposes a method of synthesis of lighting environment based on the atmospheric conditions for creating highly realistic outdoor scenes. The optical atmospheric model takes into account the effects of Rayleigh and of Mie scattering as a part of the physical model. Clouds, which enhance the reality effect of rendered images, are extracted and composed onto the spherical light image. A CIE XYZV color model is used as a visual modelto create scotopic vision. A comparison of a calculated and a measured spherical light image showed that using the proposed method can reproduce a proper lighting environment under any atmospheric conditions.

DOI： 10.3169/itej.57.1314

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Language：English   Publisher：INSTITUTE OF PURE AND APPLIED PHYSICS  

A new approach for enhancing the resolution capability of an ultrasound transducer in both axial and lateral directions is presented. A functionally graded piezoelectric composite of 1–3 connectivity is newly devised and applied to a weighted conical transducer. In this piezocomposite material, an electric field for wave excitation is effectively graded in the thickness direction, and this makes it possible to launch an almost single-pulse ultrasonic wave. Because of flexibility, this composite material can be formed easily into a conical shape and enhances the time resolution of the conical transducer that possesses good lateral resolution over a large depth. The experimental results obtained for the fabricated transducer show the capability of launching a short ultrasonic pulse and creating a focused field over a large depth.

DOI： 10.1143/JJAP.42.3233

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Other Link： https://jlc.jst.go.jp/DN/JALC/00229776557?from=CiNii

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Language：Japanese   Publisher：THE VIRTUAL REALITY SOCIETY OF JAPAN  

We have proposed the visual and haptic interface for the tele-echo system where ultrasound (US) probing can be instructed from a diagnostic to measurement site via network. In the measurement site, the surface of a patient body was captured with a CCD camera and the shape of patient was measured using the triangulation. In the diagnostic site, three dimensional image of a patient was reconstructed and a medical doctor could touch the virtual patient body with a haptic device. The position, orientation and tilt of a US probe was transmitted from the diagnostic to the measurement site with our previous proposed mark, called 'Web-Mark' and the mark was projected on the patient directly. The experimental results demonstrated that the proposed system enables to obtain US images, long axis and apex image in the shorter time as compared with the system using two dimensional information of the patient only.

DOI： 10.18974/tvrsj.8.2_131

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Language：Japanese   Publisher：THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)  

The Blind cannot detect some obstacles with a cane that is the most successful and widely used travel aid. This paper describes E-cane designed for the Blind to support their traveling by detecting such obstacles. Foregoing electric travel aids do not tell surroundings or obstacles, but just convert obtained data into certain signals such as vibration. E-cane presumes surroundings from obtained data and notify interpretation. This situation presumption mechanism understands surroundings as combinations of walls and floors. This wall/floor-strategy is designed for fast and robust processing. Experiment results show that the proposed system detects and notifies surroundings properly, therefore the Blind can walk more safely.

DOI： 10.5687/iscie.16.287

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：INST PURE APPLIED PHYSICS  

This paper describes fundamental investigations for an ultrasound catheter using laser-induced breakdown (LIB). Laser energy was transmitted through an optical fiber and lenses and focused to generate LIB in a water bath. In order to reduce laser energy for LIB generation, heavy water (D2O) was used to fill in the water bath instead of H2O. In the experiments, the ultrasound signal generated from LIB was detected with a needle hydrophone. After amplification and digitization, the signal was transferred to a personal computer (PC) and then off-line filtered. The filtered signal shows that the ultrasound signals have several peaks. The first peak is the signal directly detected with the hydrophone, while the rest of the peaks are those reflected at the water front or bath walls, indicating that the ultrasound has low directivity. We concluded that the proposed catheter is feasible for obtaining the frontal image of a blood vessel.

DOI： 10.1143/JJAP.42.3233

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer  

DOI： 10.1007/3-540-36572-9_32

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Other Link： https://dblp.uni-trier.de/db/conf/uiall/uiall2002.html#YasumuroMIKMC02

Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Image Information and Television Engineers  

Simple modeling scheme of natural scenery for presenting three-dimensional natural surrounding is proposed. According to apparent displacement on each region between consequent frames, image sequence captured by a handy DV cam is processed to generate layered image set with depth information. Experimental result shows that our approach effectively works for generating layered structure automatically.

DOI： 10.11485/itetaikai.2003w.0.54.0

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This paper proposes a new location-awareness system ALTAIR (automatic location tracking system using active IR-tag) that automatically detects and tracks the location of the mobile PC (personal computer) users. IR-tag (infrared) is a small electrical device to indicate its location by emitting IR light and reliable detected by a camera with IR-pass filter. IR-tag is installed on a mobile PC, which has wireless LAN (local area network) connection so that ALTAIR controls lighting pattern and activating time of individual IR-tag through the network. ALTAIR identifies visually detected position of the IR-tag with the IP (Internet protocol) address whom the system requires to change the lighting pattern. Utilizing DHCP (dynamic host configuration protocol) service, ALTAIR stars to aware the position of the mobile PC user when he/she enters the area within ALTAIR's coverage. Prototype ALTAIR shows the effective performance for tracking and recognizing multiple users' positions in an office environment.

DOI： 10.1109/MFI-2003.2003.1232674

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Language：English   Publishing type：Research paper (international conference proceedings)  

Wearable 3D measurement realizes to acquire 3D information of an objects or an environment using a wearable computer. Recently, we can send voice and sound as well as pictures by mobile phone in Japan. Moreover it will become easy to capture and send data of short movie by it. On the other hand, the computers become compact and high performance. And it can easy connect to Internet by wireless LAN. Near future, we can use the wearable computer always and everywhere. So we will be able to send the three-dimensional data that is measured by wearable computer as a next new data. This paper proposes the measurement method and system of three-dimensional data of an object with the using of wearable computer. This method uses slit light projection for 3D measurement and user's motion instead of scanning system.

DOI： 10.1117/12.473114

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Language：English   Publishing type：Research paper (international conference proceedings)  

There are several transporter is presented in films. This research aims to realize such transporter by using Mixed Reality (MR) technology. In this paper, the authors introduce a framework of "A Distributed MR Transporter" and following two essential technologies to realize it; 1) The coherency control protocol named "Duplication-Selection-Protocol" for comfortable and joyful collaboration in shared MR space, 2) "Ponch-3D" to acquire and reconstruct remote real space as a simplified 3D model. The proposed framework and technologies can be applicable for several practical applications. © 2003 by Springer Science+Business Media New York.

DOI： 10.1007/978-0-387-35660-0

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Swets en Zeitlinger B.V.  

Many articulated skeletal models for the human hand have been proposed to create CG images. However, the scheme for realistic hand motions is still a key issue to generate synthetic actors in CG animation. We constructed a framework which can generate natural hand postures automatically, using dynamic expressions. We introduce an optical motion capturing technique to obtain motion data of a real hand to model the basic natural motion constraints. Utilizing these constraints, we can easily design and display CG animation even without well-tuned interface devices or specific measurement equipment.

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

Utilizing the combination of the IR (InfraRed) -tag and wireless LAN (Local Area Network), this paper proposes a new location awareness system that automatically detects and tracks the location of the mobile PC users so that each user can derive the information based on the place where he/she is. The proposed system automatically starts to aware the user's position when the user enters the system region, using DHCP (Dynamic Host Configuration Protocol) service. Each user's IR-tag is controlled by the system through the network connection and tracked IR-tag is kept associated with the network information to identify the user.

DOI： 10.11485/itetr.26.60.0_13

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Language：Japanese   Publisher：Human Interface Society  

Recently, ITS (Intelligent Transport Systems) for pedestrians is paid much attention and there are many related researches, out of which, Human-Navigation System is the most actively studied. However, pedestrian traffic information is not really utilized. When walking in town, for instance, we often want to avoid pedestrians’ congestion, particularly for handicapped and higher age people. If the pedestrian traffic information is available as a real-time map for each pedestrian, it can provide variety of effective services for ITS. Storing the statistics data is also useful not only for individuals’ scheduling but the marketing business. This paper proposes the system architecture that allows to monitor the pedestrian traffic by distributed camera terminals and to map the gathered information onto a display server via network. We also propose an effective method to detect traffic information using image processing with wide-angle camera and show some experimental results.

DOI： 10.11184/hisrm.4.1_87

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Language：Japanese   Publisher：Human Interface Society  

Existing electronic devices designed to aid for the blinds’ walk occasionally may make the users confusing, because such devices force the users to pay attention and try to recognize what the device output means all the time. This paper presents a new electronic device, e-cane, with a function to sense and estimate the surface situations on the ground. E-cane measures the position and the direction of the ground surface ahead of the stick by the combination of an angle meter and multiple range sensors. Analysis of the surface sequences is done in real-time process so that the user can get the information such as a slope, walls and steps while shaking the e-cane.

DOI： 10.11184/hisrm.4.1_61

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Language：Japanese   Publisher：THE VIRTUAL REALITY SOCIETY OF JAPAN  

This paper proposes a new framework of a 3D workspace in which the "desk-top" of the personal computer (PC) and the real workspace are visually integrated together so that the user can refer and edit both digital and physical information seamlessly. Utilizing the mobility of the combination of wearable PC and head mounted display (HMD), PCs can be useful platforms for the office work. Employing a stereo pair of cameras installed on HMD, PC captures not only what the user sees but also 3D depth information in front of the user. Proposed system allows the user to handle virtual objects including web browsers, digital documents, images, 3D CG models in the same space with his/her own hand in intuitive manners without shifting the hand back and forth between a pen and a mouse.

DOI： 10.18974/tvrsj.7.3_313

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Publishing type：Research paper (international conference proceedings)   Publisher：Springer  

DOI： 10.1007/3-540-36572-9_32

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Other Link： https://dblp.uni-trier.de/conf/mva/2002

Publisher：The Institute of Image Information and Television Engineers  

DOI： 10.11485/itetaikai.02win.0.58.0

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Publisher：The Institute of Image Information and Television Engineers  

DOI： 10.11485/itetaikai.02win.0.59.0

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KLUWER ACADEMIC/PLENUM PUBL  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KLUWER ACADEMIC/PLENUM PUBL  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：INST PURE APPLIED PHYSICS  

In this paper, we propose a new framework of ultrasonic (US) three-dimensional (3D) imaging, introducing laser-induced breakdown (LIB) as an acoustic source. LIB is a phenomenon in which a substance is transformed to a plasma by a pulsed laser beam. LIB explosively emits a variety of energies such as heat, light and sound which also includes pulsed ultrasound. Emitted US waves have suitable characteristics for US 3D imaging in terms of low directivity, enabling a wide view and sharply pulsed waves. Utilizing these characteristics, we attempt to apply the synthetic aperture method for frontal 3D imaging in a real-time process. Experimental results show that even sparsely arrayed sensors allow a wider frontal view than that allowed in the case using existing transducers.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE COMPUTER SOC  

This paper proposes an interface for wearable computers using augmented reality (AR) environment which allows the user to handle virtual objects with his/her own hands intuitively. Proposed system is constructed with a wearable computer and a head mounted display (HMD). A pair of cameras is attached to HMD positioned as a pair of eyes. Using the stereo measurement, the fingers' postures are captured and displayed together with virtual objects on a video-see-though HMD. The system tracks the fingertips motion of the index finger and the thumb so as the user can pick up, move and rotate the virtual object as if treating a real object with the hands in the real world. While the stereo measurement, range information is added to the region of the hand Visual occlusion is synthesized between the user's hand and the virtual objects including 2D based graphical user interfaces, 3D computer graphics models and so on.

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

Many articulated skeletal models for the human hand have been proposed to create CG Images However, the scheme of realistic hand motions is still a key issue to generate synthetic actors in CG animation We constructed a framework which can generate natural hand postures automatically, using dynamic expression We introduce an optical motion capturing technique to obtain motion data of a real hand to model the basic natural motion constraints Utilizing this constraints, we can easily design and display CG animation even Without well-tuned interface devices or specific measurement equipments.

DOI： 10.11485/itetr.24.41.0_1

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

This paper describes a new approach for modeling the human hand by considering the dynamics and the natural constraints of the motion and the shape of hands. This hand model consists of a dynamic model and a surface model. The dynamic model is used to generate the posture of a hand. We show that the natural hand posture can be generated even when only a few hand parameters are available. The surface model is used to generate the hand shape based on the posture given by the dynamic model. The surface model is built based on the digitized three-dimensional shape of a real hand. (C) 1999 Elsevier Science B.V. All rights reserved.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

This paper describes a new approach for modeling of the human hand by considering the dynamics and the natural constraints of the motion and the shape of hands. The hand model consists of a dynamic model and a surface model. The dynamic model is used to generate the posture of the hand. We show that natural hand posture can be generated even only a few hand parameters are available. The surface model is used to generate the hand shape based on the posture obtained from the dynamic model. The surface model is built based on the digitized 3D shape of a real hand.

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

We propose the estimation method for pointing direction from users' posture to establish smooth interaction between users and virtual objects in virtual reality space. We describe the pointing direction as weighted average of reference directions which connect between some parts of user's body and the fingertip of index finger. The weights, which depend on individuals, direction and distance, are estimated through repetitive calculation. The experiments reveal that the proposed method can estimate the direction which users intend to point accurately.

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Other Link： http://id.nii.ac.jp/1001/00010005/

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

This paper proposes a three-dimensional measurement system with a simple structured system. The proposed system consists of a camera with a fish-eye lens and a cylinder whose inside is coated by a silver reflective layer. A target object is placed inside the cylinder and an image is captured by the camera from right above. The captured image includes sets of points that are observed from multiple viewpoints : one is observed directly, and the other is observed via the mirror. Therefore, the whole shape of the object can be measured using stereo vision in a single shot. An actual experimental situation was simulated and the three-dimensional shape of the target object was measured using the simulated image. In addition, a prototype system was implemented and the shape of the real objects were measured. The results have demonstrated that the proposed method is effective for measuring the whole three-dimensional shape.

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Other Link： http://id.nii.ac.jp/1001/00017985/

Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publisher：画像電子学会  

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper proposes a suitable technique for capturing sports motions. Optical motion capture systems have an advantage of less interference to moving targets, and therefore, it is often used for digitizing human actions. However, how to arrange and attach the markers on the body surface are a key issue. We pointed out two problems of conventional marker alignment. One is that the joint surface where a marker attached on is quite flexible and it might cause a large gap between the marker and the joint position during motion. The other is that measuring each joint as a point position does not provide precise axial rotation. The rotation around major axis is important for all sports forms including throwing, kicking and so forth. In this paper we propose a new method for measuring each joint point as a cross point of major axes of adjacent segments and the rotation around major axis, using optical circular-ring markers. Circular-ring marker has painted stripes along the body segment and can be used by wrapping it around a segment. The orientation of major axis and the rotation around it can be measured by extracting the stripes. The proposed approach is free from interference to the body motion and expected to be effective for sports motion capturing.

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper proposes a new method of measuring a 3D trajectory of ball. Our proposed method does not need high-speed video cameras and synchronized video cameras to measure the 3D trajectory, and the method enables to measure a continuous trajectory between shutter timings. Our approach is that a 2D ball trajectory is left on each image by slowing down shutter speed of camera, and the 3D ball trajectory can be computed using shape of silhouette method from intersection of inversion projected the 2D ball trajectory. This paper describes details of our method and experimental results applied our method to table tennis.

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Language：English   Publishing type：Research paper, summary (international conference)   Publisher：IEEE COMPUTER SOC  

This paper proposes a three-dimensional measurement system with a simple structured system. The proposed system consists of a camera with a fish-eye lens and a cylinder whose inside is coated by a silver reflective layer. A target object is placed inside the cylinder and an image is captured by the camera from right above. The captured image includes sets of points that are observed from multiple viewpoints: one is observed directly, and the other is observed via the mirror. Therefore, the whole shape of the object can be measured using stereo vision in a single shot. An actual experimental situation was simulated and the accuracy is evaluated. In addition, a prototype system was implemented and the shape of the real object was measured.

DOI： 10.1109/ICPR.2006.1189

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DOI： 10.3154/jvs.26.Supplement2_107

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Language：Japanese  

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

Colors in nature can be devided in two categories : colors which originate in pigments (coloring matter) and structural colors caused by optical phenomena at the level of microscopic structures. The structural colors have a unique characteristic that the color changes according to viewing directions and lighting conditions. This research focuses on optical path differences and proposes a generic rendering method for structual colors. This method models the microscopic structure by using textures storing physical parameters. The proposed model can be applied to various types of structural colors and is suitable for real time rendering.

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Other Link： http://id.nii.ac.jp/1001/00038124/

Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

This paper proposes a new method of measuring a 3D trajectory of ball. Our proposed method does not need high-speed video cameras and synchronized video cameras to measure the 3D ball trajectory, and it enables to measure a continuous trajectory between shutter timings. Our approach is that a 2D ball trajectory appears on each image by slowing down shutter speed of camera, and the 3D ball trajectory can be computed using shape of silhouette method from intersection of inversion projected the images. The estimated 3D trajectory does not have time stamp information. The time stamp information is given according to a correspondence between 3D trajectory and the position of ball in images when video frames are switched. This paper describes details of our method and experimental results applied our method to table tennis.

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Other Link： http://id.nii.ac.jp/1001/00052315/

Language：Japanese   Publisher：日本工業出版  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper proposes an estimation system for acquiring pedestrian distribution in public indoor spaces. This system consists of networked terminals and a server. Each terminal acquires distribution and flow of the pedestrians using wide-angle cameras and the server integrates and displays the information sent from the terminals. This research especially focuses on indoor circumstances such as shopping moles and station buildings where the passage traffic changes dynamically and the physical space is limited. Our approach requires limited number of wide-angle cameras that are capable of covering large viewing area even from the ceiling of the narrow passage. Experimental results showed effective performance for grabbing the situation of the pedestrians over time.

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Language：English   Publishing type：Research paper, summary (international conference)   Publisher：SPRINGER-VERLAG BERLIN  

We propose a novel method for measuring a whole three-dimensional shape of an object with a simple structured system. The proposed system consists of a single CCD camera and a cylindrical mirror. A target object is placed inside the cylindrical mirror and an image is captured by the camera from above. There are two or more points that have the same origin in the captured image: one is observed directly, and the other is observed via the mirror. This situation means that a point is observed by a real camera and virtual cameras at the same time. Therefore, the three-dimensional shape of the object can be obtained using stereo vision. We simulated an actual experimental situation and measured the three-dimensional shape of the object from the simulated image, and the results have demonstrated that the proposed method is useful for measuring the whole three-dimensional shape.

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Language：English   Publishing type：Research paper, summary (international conference)   Publisher：SPIE-INT SOC OPTICAL ENGINEERING  

In this paper, we propose new measurement technique of whole three dimensional shape for small moving objects. The proposed measurement system is very simple structure with the use of a CCD camera that installed a fish-eye lens and a cylinder that coating mirror inside. The CCD camera is set on the top side of the cylinder, and its optical axis is set to the center of cylinder. A captured image includes two types information. One is direct view of the target, the other is reflected view. These two information are used for measuring the shape of target by means of stereo matching. This proposed method can acquire the shape of target using only single image so we can obtaine the three dimensional shape with the moving with the use of image sequence.

DOI： 10.1117/12.586408

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Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

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Language：Japanese   Publisher：Forum on Information Technology  

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Language：English   Publisher：電子情報通信学会  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

As the medical ultrasound device is downsizing, it is expected to play important role in emergency or home-visit medicine. On the one hand, the ubiquitous computing network is being realized by the improvement in telecommunication technologies as well as the propagation of networking infrastructure. In this research, we propose a framework for tele-echography which adapts to the ubiquitous environment. While conventional tele-echography was implemented with highly integrated and heavy imaging device at patient site and transmission of image sequence, our approach transmits sound data from patient site with device deduced into network-attached ultrasound probe.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper proposes a tele-instruction system for ultrasound probe operation system using mirror based interface. A handheld ultrasound device and the Internet can realize tele-ultrasound diagnostic system at home. However, people need high level skill to obtain much ultrasound images for diagnosis. This research developed a tele-instruction system that transports techniques of skillful physician, over the shared Augmented Reality space. The proposed system provides simplicity interface for patient using a mirror based interface.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The aim of this research is developing the ubiquitous ultrasound diagnostic environment, in which a doctor and a patient can diagnose/be diagnosed anytime and anywhere. In this paper, we introduce the prototype system of the wearable ultrasound diagnostic Equipment for the ubiquitous ultrasound diagnostic environment. We also describe the wireless transmission experiment, in which the ultrasound images is transmitted to the large display, the LCD of the notebook PC and PDA, assuming some peoples watch the ultrasound images by various displays simultaneously.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

This research tries to investigate a possibility to apply Mixed Reality for supporting ultrasound echo-graphic diagnosis. We especially interested in building visual assistance for examination using ultrasound transducer. This paper shows our initial research progress and describes remaining works to be conducted in near future.

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Language：Japanese  

DOI： 10.11509/sci.SCI04.0.193.0

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

We propose a new filtering method to achieve realtime computer graphics of precise 3D shapes. By recent 3D scanning systems, it becomes possible to measure 3D shape of objects with high precision. Normally these scanners sample 3D positions of points (point clouds) on the surface of objects so that we must build polygon model before synthesizing surface-rendered computer graphics. Increase of measurement data by progress of recent 3D scanning systems, however, makes cost of creation of polygon model higher. Thus non-surface rendering including point rendering techniques are focused on. To achieve high-quality point rendering of objects scanned by such 3D scanners, we must perform some kind of filtering on obtained data since point data obtained by 3D scanner is often irregularly formed and also has non-uniform density. We have achieved one of such filtering by applying resampling and frequency analysis on point clouds.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

建築物やインテリアのデザインにおいては,対象となるオブジェクトの設計のみならず、周囲の環境を含めた概観のシミュレーションの道具として3次元CGが利用されている。しかし、実在するシーンや屋内環境にCGのオブジェクトを配置して、レイアウトや色調などを確かめるには、実在環境のモデリングが重要であり、また難点となる。本研究では,実在する環境シーンの上にレイアウト対象となるCGオブジェクトとを視覚的に融合するMixed Realityの技術を積極的に利用することで,周囲環境のモデリングを行なうことなく対話的にレンダリングを可能にするフレームワークを提案する.鏡面球と2次元コードとを有する立体マーカを対象となる実環境に配置することにより,現場での空間配置や光源環境を、ユーザのカメラ視点から読み取り、実時間処理によってMRシーンとして提示するものである。実験では、室内でマーカを並べてゆくことにより対話的シーンの色合いや空間配置を確認しながらCGオブジェクトをレイアウトすることができ,有効性が確認された。

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Language：English   Publisher：A A BALKEMA PUBLISHERS  

Modulation of JSL (Japanese Sign Language) is represented with many components such as the hand motion, the facial expression, and so on. To communicate the proper meaning of sentences, modulation is one of the integral elements for JSL. Current Japanese-to-JSL translation systems use CG (Computer Graphics) animation, called sign animation, to represent Sign Language. Sign animation without modulation is mere mechanical expression for the hearing-impaired person. This report focuses on modulation represented by hand motion and creates more human-like animations by means of analyzing captured Sign Language. A preliminary survey showed that modulation by adjectives divides hand movements into three patterns. Extracting the adjective from sentences and changing hand movements by use of three patterns produce animations including modulation. Experimental results suggest that animations produced by the proposed method are a more natural and understandable expression for the hearing-impaired person.

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Language：Japanese   Publishing type：Book review, literature introduction, etc.   Publisher：Inst. of Image Information and Television Engineers  

For presenting virtual objects in a real space, mixed reality (MR) technique is very effective to simulate an overview of a scenery. In interior design, for instance, the coordinates of the arrangements and the colours of the items need to be determined based on various layout plans. We propose a new framework for interactively arranging and rendering virtual objects in real space by manipulating physical 3D markers. A 3D marker consists of 2D codes and a spherical mirror for acquiring both geometric and photometric conditions by single camera instantaneously. Experimental results showed that the proposed approach is effective for providing appropriate geometry and local lighting conditions to present each virtual object in a simple system. The proposed system allows the user to experiment arranging of virtual furniture and verify the created scene which is visually consistent with the physical space.

DOI： 10.3169/itej.57.1307

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Language：Japanese   Publisher：The Institute of Systems, Control and Information Engineers  

The authors aim to realize a practical collaboration environment between remote users using wearable computing and mixed realit (MR) technology. The authors have proposed "Punch3D" for modeling real space as simplified and realistic 3D model. The modeling using "Punch3D" is performed following two steps; 1) making simple model using portable omni-directional camera and 2) modifying the model the user want to fix anytime. This paper describes about a modeling experiment using high-resolution camera and shows the accuracy about the tracking of the user.

DOI： 10.11509/sci.SCI03.0.3027.0

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

We propose a new filtering method to achieve real-time computer graphics of precise 3D shapes. By recent 3D scanning systems, it becomes possible to measure 3D shape of objects with high precision. Normally these scanners sample 3D positions of points (point clouds) on the surface of objects so that we must build polygon model before synthesizing surface-rendered computer graphics. Increase of measurement data by progress of recent 3D scanning systems, however, makes cost of creation of polygon model higher. Thus non-surface rendering including point rendering techniques are focused on. To achieve high-quality point rendering of objects scanned by such 3D scanners, we must perform some kind of filtering on obtained data since point data obtained by 3D scanner is often irregularily formed and also has non-uniform density. We have achieved one of such filtering by applying resampling and frequency analysis on point clouds.

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Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

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Language：Japanese   Publisher：(一社)電子情報通信学会  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We constructed the system where 3-D shape of an object could be measured and 3-D object could be presented on virtual shape. In this system, 3-D shape was measured by Slit-ray Projection using a CCD camera and a projector. Furthermore, 3-D virtual object was presented using a haptic device. The experiment results indicate that this system enables us to observe 3-D object in any direction and to touch the object.

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Other Link： http://search.jamas.or.jp/link/ui/2002158357

Language：Japanese  

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Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this paper, we propose an enhancement method of 3D imaging with sparse ultrasonic sensor array. Schematically changing the transducer position allows getting the effect to collect more signals without installing extra sensors. Using the same combination of the transducer and the receivers, it is easier to get higher correlation within the signal sequences to detect the echo from the measurement objects. We try to apply this technique for necessarily small sensors such as blood vessel endoscopies.

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Other Link： http://search.jamas.or.jp/link/ui/2001110516

Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper presents an implementation of an advanced telepathology application. Proposed system allows for real-time control of a microscope and capturing digital images sequentially through the network. Both controlling the microscope stage and image capturing are executed between a server and a client using TCP/IP sockets over 100Mbps network resources. We made it possible to change image resolution interactively for the client in order to realize real-time remote operation of the microscope so that the user can search for the ROI (Region of Interests) with higher frame rate using lower resolution images and observe and store the sample images with higher resolution. This feature is provided with a digital camera adapted to "Fire Wire", IEEE1394 standard interface, which is capable of capturing images in high frame rate and switching image resolution in hardware level. Monitoring 160×120 resolution images at 24.3[fps] and switching the resolution to 320×240 or 640×480 are achieved while controlling the microscope stage quickly through the network.

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

Many articulated skeletal models for the hand have been proposed to create CG images. We also modeled a system that can generate natural hand postures automatically. But such skeletal models are described by a very simple way using just connections of rigid sticks and rotation joints. We introduce an optical motion capture technique to obtain motions of a real hand to model the basic skeletal model. We can design the degrees of freedom of the articulated structure of the hand and analyze the lifelike hand motion if we can obtain free motions of the hand without any kinematical constraints.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper describes a new approach for hand modeling. The hand model is composed of the surface part and the bone part. The surface part of the hand model is represented by polygonal surfaces which are generated by 3D data points obtained by measuring a real hand with a laser range finder. The bone part of the model is constructed based on the structure of the bone of human hand using the X-ray CT Images. The shape of the whole hand is controlled by a dynamics model which is able to evaluate the naturalness of the posture.

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Venue：Vienna, Austria  

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Venue：Fukuoka University  

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Venue：Vienna, Austria  

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Venue：関西大学100周年記念会館  

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Venue：Singapore  

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Venue：東京大学本郷キャンパス  

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Venue：Taipei, Taiwan  

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Venue：関西大学100周年記念会館  

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Venue：大阪大学 吹田キャンパス 銀杏会館  

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Venue：Genova, Italy  

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Venue：Kyoto, Japan  

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Venue：Bandung, Indonesia  

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Venue：Banff, Alberta, Canada  

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Venue：Banff, Alberta, Canada  

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Event date： 2015.9 - 2015.10

Venue：Fukuoka, Japan  

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Venue：Middle East Technical University, Culture & Convention Center, Ankara, Turkey  

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Venue：芝浦工大，東京  

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Venue：Tokyo  

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Venue：大阪大学 豊中キャンパス  

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Venue：東京  

1) ，，，，， (2014/12/13)

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Language：Japanese  

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Venue：Limasol, Cyprus  

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Venue：京都大学東京オフィス  

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Venue：Tokyo, Japan  

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Venue：London, UK  

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Venue：London, UK  

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Event date： 2013.10 - 2013.11

Venue：Marseille, France  

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Venue：Osaka, Japan  

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Venue：仙台  

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Event date： 2012.11

Venue：Taipei, Taiwan  

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Event date： 2012.11

Venue：Taipei, Taiwan  

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Event date： 2012.10

A web-based education support system named CEAS (the Web-Based Coordinated Education Activation System) has been developed and used as a course management system on a campus-wide basis at Kansai University. The CEAS is designed to support both instructors' and students' activities involved in the teaching and learning cycle. Its user interface is designed to be compatible with instructors' workflow in managing the (ideal) teaching cycle of teaching material preparation, classroom instructions and assignment evaluation. In order to help to form an ideal learning cycle of preparation study, classroom activities and review-work for students, we propose a self-learning mobile tool named SMLT (Smart Mobile Learning Tool) aiming at enhancing students' self-motivated learning as after-session activities. We assume a particular kind of teaching routine, in which students are required to study assignment chapter(s) from the textbook before every class, and to take a true/false test on CEAS in class, followed by the instructor's comments made on the basis of collected answers. This test-and-explanation procedure is repeated ten times in each session. The accumulated scores on the CEAS are directly reflected in the final evaluation for the credit at the end of the semester. This paper gives the design of the proposed tool and shows the implementation example as an Android local application.

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Event date： 2012.9

Venue：Milan, Italy  

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Event date： 2012.7

Venue：Kobe, Japan  

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